Il8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I44 



but saw a well-preserved specimen of P. placenta Duncan and Sladen 

 borrowed from the Exeter Museum, England, 13 specimens of Ple- 

 siolampas sp. cf. P. ovalis Duncan and Sladen, from the University 

 of California, and many specimens of F. curriae Kier and P. aura- 

 dncnsis Kier in the Sedgwick Museum, Cambridge, England. Photo- 

 graphs are included of P. placenta (pi. 34, figs. 1-3) and drawings 

 of the phyllodes (text fig. 98), apical system (text fig. 100), and 

 adoral plate structure (te^xt fig. 99) in P. sp. cf. P. ovalis. As dis- 

 cussed in Kier (1957, p. 855) there has been some controversy over 

 whether the tubercles were perforate crenulate or imperforate non- 

 crenulate in this genus, but there is no doubt that they are perforate 

 crenulate in all the species. 



Range and distribution. — Paleocene to Eocene of India, Africa, 

 Europe, and Tasmania. 



Synonym of PLESIOLAMPAS 



Oriolampas Munier-Chalmas, August 1882. Bull. Soc. Geol. France, ser. 3, 

 vol. 10, p. 369; pro Neolampas Munier-Qialmas (1879) non Neolampas 

 A. Agassiz (1869). Type species by monotypy, Amblypygus imcheUm Cotteau 

 (in Cotteau and Leymerie, 1856). 



Remarks. — I have not seen any specimens of the type species, but 

 there is no doubt from a study of Cotteau's figures that this species 

 is congeneric with the type species of Plesiolampas. Munier-Chalmas 

 did not know of Duncan and Sladen's Plesiolampas when he pub- 

 lished his Oriolampas later in the same year. 



Genus CONOLAMPAS A. Agassiz 



Conolampas A. Agassiz, 1883. Mem. Mus. Comp. ZooL, vol. 10, No. i, p. 48. 

 Tj'pe species by monotypy, Couoclypus stgshei A. Agassiz. 



GENERIC DESCRIPTION 



Large, high, circular outline, adoral surface flat ; apical system 

 monobasal, petals long, straight, wnih. narrow poriferous zones, pores 

 slightly conjugate, ambulacral plates beyond petals single pored; 

 periproct inframarginal, transverse ; peristome pentagonal ; bourrelets 

 well developed, phyllodes single pored with many pores arranged in 

 three series in each half -ambulacrum ; buccal pores. 



Comparison zcith other genera. — Conolampas is very similar to 

 Echinolampas and is perhaps a synonym of it. It differs only in hav- 

 ing narrower, straighter poriferous zones in its petals. 



Range. — Recent. 



